The Hitachi Zaxis 225USR is a robust construction machine engineered for demanding work environments. Powered by a reliable Isuzu AA-6BG1T diesel engine, it delivers substantial performance with a gross power of 124 kW and a maximum torque of 647 Nm. Its hydrostatic transmission with 2-speed travel motors ensures efficient power delivery and maneuverability, while the advanced hydraulic system, featuring variable displacement piston pumps with a maximum flow rate of 449 L/min, provides precise control for various operational tasks. With an operating weight ranging from approximately 21,800 to 23,000 kg, this excavator is designed for stability and productivity in a wide array of construction and earthmoving applications. This Full Service Repair Manual provides comprehensive guidance for the maintenance and repair of the Hitachi Zaxis 225USR. It covers essential technical specifications, including detailed engine data, transmission system information, and hydraulic system parameters. Furthermore, the manual outlines critical maintenance procedures, such as fluid capacities for engine oil, hydraulic oil, coolant, and fuel. Owners, technicians, and mechanics will find detailed instructions and diagrams to ensure the optimal performance, longevity, and safety of their equipment.